00273nam a2200109 a 450000500170000008200130001710000200003024500320005026000330008230000290011550000190014420251203091417.0  a570bWES  aHopson, Janet L  aBiologybWessells, Norman K  aNew YorkbRandom Housec1988  axxviii,1251p.c28cm.bHB  aincludes index